关键词: 变传动比齿轮, 平行轴变传动比齿轮副, 齿轮元, 数值计算

Abstract: To solve variable ratio gear design problem of parallel-axis variable ratio gear pair,a new digital design method was proposed.By considering the design factors such as modification of constant ratio gear,relationship between base circle and dedendum circle,meshing traversal and tip clearance of gear pair,the constant ratio gear was taken as a set of cutting planes obtained by using countless planes perpendicular to the axis to cut the gear,and each cutting plane was called a gear element.Assuming there was a line through a point on the variable ratio gear billet top land and parallel to the connecting line between two base circle centers of gear pair,it would generate a series of intersections between this line and the corresponding gear elements,and the altitude value of arbitrary tooth profile point was the minimum of all intersection values.The mathematical model to solve the altitude values of variable ratio gear tooth profile points was established and the corresponding solution algorithm was developed.Tooth profile point cloud of a variable ratio gear was obtained based on this method,and relevant tests of transmission error and transmission stability on the sample were performed.The experimental results verified the effectiveness of the proposed method.

Key words: variable ratio gear, parallel-axis variable ratio gear pair, gear element, numerical calculation